add threshold in GRAD-CAM

[laborer123]

if the blue region is restored to the original image by threshold could be better

[laborer123]

cv2.addWeighted can‘t solve this problem. because it's mapped from the heatmap

[RaphaelMeudec]

I'm not sure what you mean. Do you mean that the activation map overlay should be thresholded?

[laborer123]

I'm not sure what you mean. Do you mean that the activation map overlay should be thresholded?

I think the blue area could restore original image pixel value, only show the circled part of heatmap, but i didn't find a way to do that